Section 12F. There shall be in the department, and under the general supervision and control of the commission, a transportation division which shall be under the charge of a director, who shall be subject to chapter thirty-one and the rules and regulations made under authority thereof. The commission shall appoint said director. Said division, subject to such supervision and control, shall perform such functions in relation to the administration and enforcement of chapter one hundred and fifty-nine B imposed upon the department by said chapter as the commission may from time to time determine by order duly recorded in the office of the commission and open to public inspection. Such an order may also provide for appeals to the commission from rulings and decisions of said director. The commission may employ such assistants and employees to serve in said division as it may deem necessary, and may assign for service in said division such number, not exceeding twenty-five, of investigators and examiners as it may deem necessary.

The railway and bus division and all the powers, duties and responsibilities assigned to said railway and bus division shall be transferred to said transportation division.